Electric



Dec. 26, 1933." M FANS, 1,940,692

ELECTRIC HAMMER Filed Nov. 19, 1931 INVENTOR.

Patented Dec. 26, 1933 UNITED s'rA'r s meme Michael Parisi, New York, N. Y., assignor to I Illdol'. Goldberg, New York, N. Y.

r 1 AppIioationulVovembeI- -IQ, 1931 M .seriainas'zaosomm; (CL 172-125) The principal object of this invention consists oi producing a portable electric hammer,sultable for use in trades and adaptable to' general hammering work, or like metal stamping, riveting or die casting, punching, scaling, or cutting operations, when of limited weight. The present design being approximately half the actual.

size. For heavy forgings, or any other industrial uses requiring greater power, hammers of 10 larger proportions can be designed on the same general lines herewith indicated. They present hammer design is intended to work from an'electric lighting socket, at 110 volts, and direct current only. It should be understood that where alternating current is the only supply available, this hammer can be operated thereon, provided a thermionic valve or rectifier is inserted in the supply circuit, iurnishing from three to five amperes. With these and other objects in view, which will be fully described hereafter, and to render clearer the working of my invention, I have attached this drawing, in which:

Fig. l is a diagram showing the general principle on which my invention works. as Fig. 2 indicates a longitudinal cross section of the hammer.

Figs. 3, 4, 5 and 6 indicate a i'ew of the tools and dies suitable for use with this hammer.

In Fig; 1, numeral (1) indicates a base receptacle through which the current enters the apparatus. One 01 the conductors (4) from said receptacle-through a switch (5) enters the winding oi a solenoid (7) while the other end of this winding through conductor (3) forms an integral part of the circuit of a timing relay (2). This timing relay may consist of an ordinary electromagnetic make and break device, or a split second watch mechanism suitable to be timed for closing and opening the circuit i'rom one to a few times per second. Such timing relay being of a standard make, does not need any further description. Each time the current enters the solenoid, it will magnetize a short laminated core (6) which will attract the plunger (8) until the same will slide in the open core of the solenoid. The plunger (8) forming an integral part of a soft iron disc (9) to which are attached tour coiled steel springs, of which only two (10-11) the falling mass of the hammer, thus increasing considerably the force'ot the blow. This operation is repeated rapidly and the number of blows perminute depends mainly upon the design, the size of the parts and the length 0! the stroke of the apparatus. l

Fig. 2 shows a cross sectional view of a hammer'of this kind. The whole mechanism is contained in a cylindrical casing oi duraluminum (34) carrying a handle (14). This casing being as cast intwo half rounds, and each half is provided with a number oi. flanges and holes for holding them together by means of bolts and winsnuts. In Zone-half of the casing is removed, to show the inner arrangement 01 the parts, and other details or the hammer. In the upper part of said casing, numeral (1) indicates a receptacle through which the current from a lighting socket enters theapparatus. The circuit goes through the timing relay (2) and the winding ('1) with switch (5). When the current energizes the solenoid, its core (6) will attract the plunger (8) and to accelerate its uplifting action, the iron (9) will act as an armature to the eilect o! the magnetic flux produced from the coil ('1). It will be noted that the casing (34) is provided. with several small orifices (36-37) (38-39) (40-41) these being; necessary i'or the ventilation oi the apparatus. It should also be noted that the casing (34) is provided with a number oi' circular partitions (21-22-23) and others, said partitions having a central hole, through which the hammer head .(12) moves up and down, and being guided in its movements by said partitions. Between two or these partitions, there is a space filled with greased cotton ,waste (24) gtor the purpose of keeping the hammer head well lubricated. There are also provided holes (42-43) through which oil can be supplied to the lubricating chamber. At the lower end of the cylindrical casing ot the apparatus, there are attached two tool retainers (26-27). These retainers areot ahalt round and conical shape, and their inner space is of a shape to m the shank otthetoolto beheld 10o therein. An outside sleeve (23)" with a conical hole (30) is provided to'ia'sten in the tool re taming chamber whatever tool is tobe used with the hammer. It should be understood that all tools to be used with thishammer, shall have similar shanks, and said shanksto be made somewhat smaller than the inner chamber of the tool retainers, thus allowing the tool therein to move freely up and down, thereby minimizing vibrations aiIecting the casing of the apparatus.

With Fig. 3 I have indicated a hammer tool, and with Figs. 4, '5 and 6, a round head rivet die, and a square head rivet die, and a cutting tool, respectively. Many other kinds 01 dies or tools can be used with this hammer. It should be understood that in having thus described my invention, I do not intend to limit myself to the present design; the above being only for the purpose of disclosing the idea, and many changes can be brought to its present structure, without parting from the spirit of my invention. Having thus described my invention, what I claim and wish to be protected by Letters Patent in the United States, is:

In an electric hammer, a solenoid, current disposed within at least one of the surfaces between the concentric bearing surfaces.

IMICHAEL PARISI. 

